An individual with achlorhydria (lack of or low gastric acid in stomach) may have abdominal pain due to difficulty digesting food, loose bowel movements & problems due to poor absorption of nutrients.
Foods for Good Digestion # 5: Sweet potatoes. Sweet potatoes, especially when consumed with their skins on, are a superb food for digestive health. They provide dietary fiber, complex carbohydrates and manganese. Sweet potatoes help in treating peptic ulcers, duodenal ulcers and some other serious bowel ailments.
Insoluble fiber from whole grains and beans help clean the digestive tract. Fiber helps keep digestion running smoothly. Fruits and vegetables are good sources of fiber. Whole grain breads contain insoluble fiber.